Landslide hazard zonation mapping using multi-criteria analysis with the help of GIS techniques: a case study from Eastern Himalayas, Namchi, South Sikkim
Landslide hazard zonation mapping using multi-criteria analysis with the help of GIS techniques: a case study from Eastern Himalayas, Namchi, South Sikkim
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DOI：
10.1007/s11069-019-03580-w
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发表时间：
2019-03-01
期刊：
影响因子：
3.7
通讯作者：
Das, Debasish
中科院分区：
文献类型：
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作者：
Bera, Amit;Mukhopadhyay, Bhabani Prasad;Das, Debasish
滑坡是山地灾害中最具破坏性的灾害现象之一，经常导致严重的问题。南锡金地区的纳姆奇地区作为东喜马拉雅地区的一部分也不例外。在GIS平台（ArcGIS 10.1）中集成了坡度、降雨分布图、线性体密度、排水密度、坡向、地质、土地利用/土地覆盖和土壤图等多个专题层，以划定滑坡危险区。采用层次分析法确定各因素的权重。根据其对滑坡触发因素的相应影响，为每个专题层的子类分配相对评级值，并在专题层内，为每个类别分配从0到9的顺序评级。利用加权叠加技术，编制了纳姆奇地区滑坡危险性区划图。将纳姆奇地区滑坡灾害危险度图划分为极低、低、中、高、极高5个易发区。通过野外调查和基于地理空间技术的分析，进一步验证了滑坡危险性区划图的有效性。研究结果表明，高滑坡危险区与活跃的侵蚀过程（陡坡/切坡/线性）的地区。结果表明，那些村庄Bomtar、Jorethang、Kopchey、Donok、Namthang、Sumbuk、Longchok、Mamring、Turung、Mikkhola等村庄极易发生滑坡。最终的滑坡灾害区划图可用于滑坡灾害防治、合理规划纳姆奇地区未来的基础设施和地质环境发展。
Landslides are one of the most damaging disastrous phenomena that frequently lead to serious problems in hilly areas. The Namchi region of South Sikkim district as a part of Eastern Himalayas is not an exception to it. In the present study, multi-criteria analysis technique is used for landslide hazard zonation mapping. Various thematic layers, namely slope, rainfall distribution map, lineament density, drainage density, slope aspect, geology, land use/land cover and soil map, were integrated in a GIS platform (ArcGIS 10.1) to delineate landslide hazard zone. Analytic hierarchy process was used to determine the weight values of different factors. Relative rating values are assigned for the subclasses of each thematic layer based on their corresponding impact on the landslide triggers, and within a thematic layer, each class was assigned an ordinal rating from 0 to 9. The landslide hazard zonation map of Namchi region was produced based on weighted overly techniques. The landslide hazard map of Namchi region is divided into five vulnerable zones, namely very low-, low-, moderate-, high- and very high-hazard zones. Resulted landslide hazard zonation map was further validated with field study and geospatial technology-based analysis. The findings demonstrate high-landslide-hazard zones are associated with areas of active erosive processes (steep slopes/cut slopes/lineaments). The results indicate the villages Bomtar, Jorethang, Kopchey, Donok, Namthang, Sumbuk, Longchok, Mamring, Turung, Mikkhola, etc. are highly prone to landslides. The final landslide hazard zonation map can be used for the landslide hazard prevention, proper planning of future infrastructure and geoenvironmental development in Namchi region.